Extrusion press



Dec. 6, 1938. o. z. KLOPS CH 5? AL EXTRUS ION PRESS 4 Sheets-Sheet 2Original Filed March 23, 1936 FIG.4.

INVENTORS OTTO Z.KLOPSCH GUY H. BRADLEY hm,

A TTORNEYS Dec. 6, 1938.

0. Z. KLOPSCH ET AL EXTRUSION PREss Original Filed March 23, 1936 4Sheets-Sheet 3 FIGJI.

m m T N CY awn W V D T. N M /.K.B.MA NH WW d Dec. 6, 1938.

0. z. KLOPSCH ET AL EXTRUSION PRESS Original Filed March 23 1936 4Sheets-Sheet 4 S KLOPSCH 11v VENTOR OTTO Z. GUY H. BRADLEY MM 15 A TTORjVE Y s Patented Dec. 6, 1938 UNITED STATES ax-rausrou muss Otto Z.Klopsch and Guy H. Bradley, Pleasant Ridge, Mich., assignor to WolverineTube Company, Detroit, Mich., a corporation of Michig an Originalapplication March 23, 1936, Serial No.

70,458; Divided and this application December 21, 1936, Serial No.117,064 a 13 Claims.

This invention relates generally to metal working machines embodying apunch and refers more particularly to improved means for cooling thepunch. This application is a division of our copending applicationSerial No. 70,458, filed March 23, 1936.

More specifically, the present invention contemplates cooling apparatusfor use in association with an extrusion press to effectively cool theextruding tool subsequent to the extrusion operation, and has as one ofits principal objects to provide a cooling device capable of beingreadily positioned in operative relation to the extruding toolimmediately after the latter has perfomed its extruding force.

Another advantageous feature of the present invention consists in theprovision of a cooling device supported on the extrusion press to oneside of the extruding tool and capable of being readily swung to aposition in the path of travel of the tool when it is desired to coolthe latter.

A further object of the present invention resides in the provision of acooling device having an extensible receptacle movable into the path oftravel of the punch and operated by the punch upon relative movement ofthe latter and receptacle in one direction to distend suiiiciently tocompletely house the punch.

In addition, the present invention contemplates a cooling device havingan extensible punch receiving receptacle which, when collapsed, has adepth less than the length of the punch to be cooled and beingextensible upon movement of the same upwardly relative to the punch tohouse the portion of the tool to be cooled. This construction isadvantageous in cases where the cooling device is positioned between thework holder and lower end of a reciprocable punch, since itpermitsefiectively cooling the punch even though the travel of the punchfrom its uppermost position to the work holder is less than the lengthof the punch to be cooled. The-foregoingas well as other objects, willbe made more apparent as this description proceeds, especially whenconsidered in connection with the accompanying drawings, wherein:--

Figure l is a side elevational view of an extruding pressconstructed inaccordance with this invention;

Figure 2 is a fragmentary sectional view illustrating the positions ofthe working parts of the apparatus prior to the extruding operation;

Figure 3 is a view similar to Figure 2, showing the relative position ofthe parts after the extruding operation;

Figure 4 is a similar sectional view showing the piercing die in itsretracted position and illustrating the flange at the upper end of thetube resulting from the extruding operation;

Figure 5 is a fragmentary sectional view illustrating the severing punchin operative relation with respect to the apparatus;

Figure -6 is a view similar to Figure 5, showing the position of thesevering punch just prior to removing the flange from the end of thetube;

Figure 7 is a fragmentary longitudinal sectional view illustrating themanner in which the severing punch is operated;

Figure 8 is a similar sectional view illustrating the relative positionof the parts subsequent to the severing operation;

Figure 9 is a fragmentary sectional view illustrating the severing punchin its retracted position;

Figure 10 is a semi-diagrammatic plan view, partly in section,illustrating the mounting for the severing punch and showing the latterin its operative position;

Figure 11 is a view similar to Figure 10, showing the actuating meansfor the severing punch in its operative position;

Figure 12 is a fragmentary side elevational view of the apparatusshowing the cooling means in operative position with respect to thepiercing punch;

Figure 13 is a semi-diagrammatic plan view of the construction shown inFigure 12;

Figure 14 is afragmentary view similar to Figure 12, showing the coolingmeans in the position the same assumes during its operation;

Figure 15 is a cross sectional view through the cooling means; and

Figure 16 is a plan view of the construction shown in Figure 15. y

In general, a billet A is pre-heated to the proper temperature and isinserted into a container in seating relation with an extruding die. Inaccordance with conventional practice, the billet is urged toward theextruding die by means (not shown) adapted to exert a pressure on theupper end of the billet. Upon completion of this operation, the billetassumes the position thereof shown in Figure 2 andthe piercing punch 13is actuated to successively pierce the billet A and extrude the latterthrough the die around the piercing punch B, in the manner clearly shownin Figure 3.

As a result of extruding the billet through the die, a flange 0 remainson the upper end of the extruded tube in engagement with the upper faceof the die'and, after the piercing punch B has been returned to theposition thereof shown in Figure 4, a shearing punch D is swung into theposition thereof shown in Figure 5. The shearing punch D is then loweredrelative to the piercing punch B to the position thereof shown in Figure6, wherein the. cutter E at the lower end of the punch assumes anoperative position with respect to the upper end of the extruded tube.

After the shearing punch has been moved to the position illustrated inFigure 6, a spacer F for the punch is moved to the position thereofshown in Figure 7, wherein the lower end of the actuator abuts the upperend of the shearing punch. Upon positioning the parts in the foregoingmanner, the piercing punch B is lowered and during its downward travel,engages the upper end of the spacer F to move the cutting portion of thetool E at the lower end of the shearing punch through the extruding die,in the manner shown in Figure 8. Of course, movement of the cutter Ethrough the extruding die, in the manner specified above, severs theflange C from the upper end of the extruded tube and permits the tube todrop out of the apparatus. Upon completion of the severing operation,the spacer F is returned to its inoperative position and the severingpunch D is retracted from the billet container to the position thereofshown in Figure 9 and due to the particular construction of the cuttingtool E, the flange C is removed from the billet container as a unittherewith.

The severing punch D is then swung to its inoperative position shown inFigure 13 and the quenching or cooling device G is swung to the positionof the same shown in Figure 12 of the drawings. After the cooling deviceG is swung to the position aforesaid, the same is actuated to surroundthe piercing punch B, in the manner shown in Figure 14, and the coolingmedium is sprayed, or otherwise discharged, upon the piercing punch.

Referring now more in detail to the particular construction of theapparatus briefly described above, it will be noted from Figure 1 thatthe piercing punch B is secured to a head 20 reciprocably mounted upon aframe 2| of the machine and actuated through the medium of a fluidpressure operated piston (not shown). The piercing punch comprises astem 22 having a reduced threaded portion 23 at-the lower end fordetachably receiving a punch head 24 provided with a frusto-conicallyshaped portion 25 at the lower end. The head 24 is apertured to receivethe piercing pin 26 and serves to secure the latter to the lower end ofthe stem 22.

The stem 22 issecured to the lower end of the reciprocable slide 20 inalignment with a billet container 21 fixedly supported on the machineframe 2| and having the bore therethrough lined with a bushing 28 of adiameter predetermined to receive the piercing punch B. Upon referenceto Figure 2, it will be noted that an extruding die 29 is secured withinthe lower end of the bushing 28, in such a manner that the opening 30through the die is in perfect axial alignment with the piercing pin 26so as to permit the latter to pass therethrough, in the manner shown inFigure 3. The extruding die 29 is supported on the machine frame throughthe medium of a fabricated structure designated generally herein by thereference character 3| and the several parts of this structure areprovided with openings therethrough in alignment with the opening 30through the extruding die to permit the billet A to be extruded aroundthe piercing pin 26 to form the tube. Upon reference to Figures 2 to 9,inclusive, it will be noted that the upper surface of the extruding die29 corresponds in shape to the frustoconical surface 25 of the punchhead 24 and serves to form a similar surface on the lower end of thebillet A during the initial step (not shown) of the method ofmanufacture previously described as exerting a pressure on the upper endof the billet A to .urge the same'into engagement with the extruding die29. After this initial step of the operation has been effected, the head20 is lowered and the billet A is pierced by the pin 26 and is extrudedthrough the die 29 to form the tube designated in Figure 3 by thereference character 32.

It has been stated above that as a result of the extruding operation, aflange C is formed on the upper end of the tube 32 and that this flangeis severed from the tube by means of the shearing punch D. The shearingpunch D is shown in Figures 5 to 9, inclusive, as comprising a holder 33carrying the cutter E at the lower end thereof and secured at the upperend to the free end of an arm 34. The opposite end of the arm 34 isprovided with a boss 34' journalled on a vertical shaft 35 which, inturn, is supported by the free end of a bracket 36 having the oppositeend journalled on a vertical shaft 31 supported on the machine frame forreciprocation in the direction of its axis. Upon reference to Figure 1.it will be noted that the lower end of the shaft.3'| has a piston 38secured thereto and adapted to be actuated by fluid pressure admitted tothe cyiinder 39 on the machine frame through the lower end of thecylinder.

Assuming that the shaft 31 is in its uppermost position and that thepiercing punch B has been returned to its uppermost position subsequentto the extruding operation, the bracket 36, together with the arm 34, isswung inwardly to the position thereof shown in Figure 10 wherein thesevering punch is in alignment with the bushing 28 of the billetcontainer 21. In this connection, attention is called to the fact thatthe holder 33 for the cutter E and the free end of the arm 34 areslotted in the manner indicated in Figure 5 by the reference character40' to receive the piercing 'pin 26. This construction is desirable inthat it offers the possibility of reducing the extent of travel of thepiercing punch B to the minimum and, at the same time, renders itpossible to locate the severing punch D in its operative positionbeneath the piercing punch head 25.

When the severing punch D is in its operative position, or in theposition thereof shown in Figure 5, the fluid pressure in the cylinder39 is exhausted permitting the shaft 31 to return to its lowermostposition by the action of gravity. Inasmuch as the severing punch D iscarried by the bracket 36, which, in turn, is secured to the shaft 31,it necessarily follows that the severing punch D is moved downwardly asa unit with the shaft 31 and assumes the position thereof shown inFigure 6.

Movement of the vertical shaft 31 downwardly in the aforesaid manneralso locates the spacer F in a position to permit the same to be swunginwardly to a position in alignment with the severing punch D. In thisconnection, it will be noted that the spacer F is carried at the freeend of an arm 4|, similar to the arm 34 in that the opposite end isjournalled on the shaft 35 above the arm 34. Upon reference to Figure10, it will ing die." and the arm 4| is swung in the direc- 76 tion ofthe arrow 43 to locate the spacer F in alignment with the severing punchD. As shown in Figure 7, the spacer F and free end of the arm 4| arealso slotted, as at 44, to receive the piercing pin 26. The slot 44 inthe spacer F cooperates with the corresponding slot 40 in the shearingpunch D to provide the minimum travel of the piercing punch B, and thisis desirable in that it not only reduces the cost and weight of theapparatus, but also increases the speed of operation of the same.

When the spacer F is in the position thereof shown in Figure 7, thepiercing punch B is lowered through the medium of the slide 26, causingthe head 25 of the punch to engage the upper end of the spacer F and,since the lower end of the latter engages the upper end of the shearingpunch B, it necessarily follows that continued downward movement of thepiercing punch B efiects a corresponding movement of the shearing punchD. As the shearing punch D is moved downwardly, the tool E serves theflange C from the upper end of the extruded tube 32 and permits thelatter to drop out of the apparatus. This latter operation is clearlyshown in Figure 8 of the drawings, and it will be noted from this figurethat the annular cutting portion 45 of the tool presents a shoulder 46adapted to remove the flange C from the billet container upon movementof the shearing punch D to the position thereof shown in Figure 9.Before the shearing punch D is moved to the position shown in Figure 9,the slide 20 is returned to its uppermost position by means of fluidpressure operated pistons in the form of rods 41 connected at the upperends to the slide and having the lower ends slidably mounted in thecylinders 48. After the slide 20 has been moved to its uppermostposition, the spacer F is swung to its inoperative position and theshaft 31 is moved upwardly by admitting fluid pressure into the cylinder39 beneath the piston 38. This action locates the shearing punch D inthe position thereof shown in Figure 9 and permits the latter to beswung to its inoperative position.

Upon reference to Figure 13, it will be noted that in successivelyswinging the spacer F and shearing punch D to their inoperativepositions, the former is swung in the direction of the arrow 49 shown inthis figure and the latter is swung in the opposite direction. Inasmuchas the cooling device G is connected to the boss 34' of the shearingpunch carrying arm 34 by means of an arm 50, it necessarily follows thatmovement of the arm 34 to its inoperative position against the stop 50',shown in Figures 10, 11 and 13, automatically positions the coolingdevice G in operative relationship to the piercing Punch B.

Upon reference to Figure 15, it will be noted that the cooling device Gcomprises, in general, two telescopically engaging units 5| and 62. Theouter unit 5! is substantially cup-shaped and is supported upon the freeend of the arm for vertical sliding movement relative thereto. The innerunit 52 is fixedly secured to the free end of the arm 50 and isoperatively connected to the section 5| through the medium of springs53.

The inner-unit 62 of the cooling device comprises atubular member 54sleeved upon and permanently secured to an annular ring portion 55 onthe free end of the arm 56 and having means 56 at one side cooperatingwith corresponding means 51 on an adjacent side wall of the unit 5| toguide the latter throughout its movement relative to the unit 62/ Inaddition,

the unit 52 is provided with an assembly 59 for receiving and sprayingcooling medium upon the piercing punch B. In detail, the assembly 59 issupported within the annular collar portion 55, at the free end of thearm 50, in concentric relation with the tubular member 54 and is securedto the upper end of the collar portion by means of the anchoringbrackets 60 for the springs 53. Asshown in Figure 15, the assembly 59comprises a chamber 6i communicating with a source of fluid underpressure through the medium of a conduit 62 and having openings 63 inthe side walls thereof for discharging the cooling medium against thepiercing punch B. In addition, the assembly 59 is provided with a secondchamber 64 spaced below the chamber 6| and communicating with a. sourceof cooling medium under pressure through the medium of a conduit 65. Thechamber 64 comprises an annular detachable collar 66 at the lower endthereof having the side walls apertured, as at 61, to provide fordischarging cooling medium against the piercing punch B. In actualpractice, the discharge opening 63 provides for spraying cooling mediumon the head 24 of the piercing punch while the openings 61 discharge thecooling medium on the piercing pin 26 of the piercing punch.

'As will be apparent from Figure 12, the two units of the cooling deviceare in their inoperative positions when swung into operative relationwith the piercing punch B and are held in their inoperative positions bymeans of the springs 53. After the cooling device has been properlypositioned with respect to the piercing punch B, the shaft 31 is raisedcausing a corresponding upward movement of the device G until the lowerend of the Piercing pin 26 engages in a saddle 68 secured within thecup-shaped unit 5| on the bottom wall of the latter. As a result, theunit 5! is arrested and the unit 52 continues to move upwardly againstthe action of the springs 53 until the device is fully extended, oruntil the piercing punch is completely housed therein. The coolingmedium under pressure is then discharged into the two chambers 6| and 64surrounding the piercing punch and the latter is effectively cooled. Itwill be understood that the cooling medium is drained from the coolingdevice by means of aconduit shown in Figure 16. Upon completion of thecooling operation, the shaft 31 is again returned to its lowermostposition by exhausting the cylinder 39, whereupon the springs 53 returnthe two units of the cooling device to the positions thereof shown inFigure 12. The cooling device may then be swung to its inoperativeposition and the arm 36 is preferably swung outwardly about the axis ofthe shaft 31 to permit the cycle of operation previously described to berepeated.

Although the cooling device previously described may be used toadvantage in connection with various different types of punch presses,nevertheless, its use is particularly advantageous in machines whereinthe stroke of the punch is reduced to the minimum. Asa matter of fact,in the present illustrative embodiment of the invention, the distancebetween the top of the work holder 21 and the lower end of the punch 26,in the uppermost position of the latter, is less than the length of thepunch to be received by the cooling device. With the cooling devicepreviously described, the collapsed height of the latter is less thanthe distance aforesaid so as to permit the device to be swung into thespace between the work holder and punch when the latter is in itsuppermost position. Notwithstanding the fact, however, that thecollapsed height of the cooling device is sufliciently less than theportion of the punch to be cooled to permit positioning the devicebetween the lower end of the punch and work holder, the punch isefiectively cooled by virtue of the fact that the device is extendedupon movement of the same in an upward direction to receive the punch.

What we claim as our invention is:

1. In an extrusion press, a piercing tool, an extensible cooling deviceadapted to be supported in axial alignment with the punch and beingextensible in the direction of length of the tool upon relative axialmovement of the tool and device in directions toward each other tosubstantially house said punch.

2. In an extrusion press, an extruding tool, an extensible coolingdevice adapted to be supported in alignment with the tool for movementaxially of the tool to receive the latter and having a portioncooperating with the tool to effect an extension of the device in .thedirection of length of the tool.

3. In an extrusion press, an extruding tool, a cooling device comprisingtelescopically arranged parts adapted to be supported in alignment withthe tool for movement axially of the tool in a direction to receive thesame, means carried by one of the parts and engageable with the toolupon movement of the device toward the latter to effect an extension ofsaid device, and means discharging a cooling medium against the tool.

4. In an extrusion press, a reciprocable extruding tool, a coolingdevice supported to one side of the tool for swinging movement about anaxis parallel to the path of travel of the tool to a position in axialalignment with the tool, means for moving the device along said path oftravel toward the tool to position the latter within the same, and meansfor discharging cooling medium against said tool. 7

5. In an extrusion press, an extruding tool, a cooling device comprisingtelescopically engaging parts and supported for swinging movement into aposition in alignment with the tool to receive the latter upon relativemovement of the tool and device toward each other, and means on one ofthe telescopically engaging parts engageable with the tool upon therelative movement aforesaid to extend said device.

6. In an extrusion press, an extruding die,

means for supporting stock on the die, a. member movable toward the dieto force the stock therethrough, means for moving said member in adirection away from the die subsequent to the extruding operation, acooling device supported to one side of the member and movable into thepath of travel of the latter between the same and said die, and meansfor effecting relative axial movement of the member and cooling deviceto locate the former in the latter.

7. In a machine having a reciprocable punch,

a cooling device having an open ended receptacle supported to one sideof the path of travel of the punch for movement into said path'of travelwith the open end of the receptacle in registration with the punch, andmeans for effecting relative movement of the punch and cooling devicetoward each other along said path of travel to locate the punch withinsaid device. I

8. In a machine having a reciprocable punch,

a cooling device having a receptacle extensible in the direction of thepath of travel of the punch and supported to one side of the path oftravel of the punch and movable into said path of travel, and means forrelatively moving the punch and receptacle toward each other andeifective to extend the receptacle.

9. In a machine, a reciprocable punch, a cooling device having anextensible receptacle adapted to be supported in the path of travel ofthe punch and being extensible in the direction of the path of travel ofthe punch upon relative movement of the punch and receptacle toward eachother to substantially house said punch.

10. In a machine, a reciprocable punch, a cooling device having anextensible receptacle movable into the path of travel of the punch andin its collapsed position having a depth less than the length of thepunch to be cooled, and means efiective upon relative movement of thepunch and receptacle toward each other to extend the receptacle to housethe portion of the punch to be cooled.

11. In a machine, a work holder, a punch supported for reciprocationtoward and away from the work holder, a cooling device having anextensible receptacle provided' with a depth less than the distancebetween the work holder and lower end of the punch when the latter is inits uppermost position, means supporting the receptacle for movementinto the space between the work holder and lower end of the. punch whenthe latter is in its uppermost position, and means effective uponrelative movement of the punch and receptacle toward each other tolocate the punch within the receptacle and to extend the latter tocompletely house the portion of the punch to be cooled.

12. In a machine having a work holder, a punch movable toward and awayfrom the work holder and having a length of travel from the uppermostposition thereof to the top of the work holder less than the length ofthe punch to be cooled, a cooling device provided with an extensiblereceptacle having a collapsed height less than the distance between thetop of the work holder and the lower end ofthe punch in its uppermostposition, means for positioning the receptacle between the top of thework holder and lower end of the punch, and means for moving the coolingdevice in a direction toward the punch and for extending the receptacleto receive the length of the punch it is desired to cool.

13. In a machine having a work holder, a punch movable toward and awayfrom the work holder and having a length of travel from the uppermostposition thereof to the top of the work holder less than the length ofthe punch to be cooled, a cooling device provided with an extensl-- blereceptacle having a collapsed height less than the distance between thetop of the work holder and the lower end of the punch in its uppermostposition, means for positioning the receptacle between the top of thework holder and lower end of the punch, means for moving the receptaclein a direction toward the punch, and means on the receptacle engageablewith the punch upon movement of the former toward the latter andeilfective to extend the receptacle to receive the portion of the punchit is desired to cool.

OTTO Z. KLOPSCH. GUY H. BRADLEY.

